Friction-clutch for throttle-valves



(No Model.) 2

E. R. TRAMMELL.

FRICTION CLUTCH FORTHROTTLE VALVES.

Patented Odt. 17, 1882.,

LIT/5.09.1.

"Lin e .s .s es

UNITE STATES 'FFICE.

A'rENT FRICTION-CLUTCH FOR TH ROTTLE-VALVES.

SPECIFICATION forming part of Letters Patent No. 266,224, dated October17, 1882.

Application filed J une 14, 1882.

To all whom "it may concern:

Be itknown that I, ERASMUS R. TRAMMELL,

. ot'Birmingham,in the county of Jefferson, and

in the Stateot Alabama,have invented certain new and useful Improvementsin Friction- Glutchcs for Throttle-Valves; and I do hereby declare thatthe following is a full, clear, and exact description thereof, referencebeing'had to the accompanying drawings, and to the letters of referencemarked thereon, making a part of this specification.

This invention relates to certain improvements in friction-clutches forall classes of levers, to hold the said levers in any desired position;but it is specially designed to be applied to the lovers employed tocontrol the throttle-valves of locomotive and other similar boilers, andsecure the throttle-valve in any desired position with respect to itsseat, as more fully hereinafter specified.

The objects of my invention I accomplish by the means illustrated in theaccompanying drawings, in which Figure 1 represents a side elevation ofmy improved friction-clutch applied to a lever. Fig. 2 represents asectional view on the line a; a: of Fig. 1, and Fig.3 represents adetached view of a portion of my device in side elevation.

The letter A indicates a lever, which is fulcrumed to a bracket,standard, or other support, B, secured to the boiler-head. The saidlever has loosely connected to itat O the throttle-valve rod D, whichextends into the boiler through the head of the same, as usual.

The letter E indicates a bracket,which is secured to the boiler-head andprovided with a segmental slot, F, into which projects, or through whichextends, a bolt, G, which is elliptical or approximately elliptical incrosssection, the said bolt being pivoted in a bearing in the lever A,so as to turn freely therein, and having rigidly fastened at one end anarm, l:[,which is connected bymeans of alink,

, I, with a lever, K.

The letter M indicates a bifurcated rod having a shoulder at its lowerend, andN a spring (No model).

surrounding the rod and bearingagainstalug, P, on the lever A, (throughwhich lug one end of the rod extends,) and against the shoulder of therod, the recess setting against the edge of the arm H, so as to hold theparts in normal position. When in such position the bolt bends in theslot, as indicated in Fig. 3, and when it is required to operate thedevice the auxiliary lever is operated so as to bring the longerdiameter of the elliptical bolt in a line parallel with the walls of theslot and relieve the said bolt, so as to permit the lever A to be moved.

Having thus described my invention, whatI claim, and desire to secure byLetters Patent, 1s

1. In combination with the lever fulcrumed to a bracket secured to theboiler-head, and having connected to it the throttle-valve rod, thebracket provided with a segmental slot, the bolt, elliptical orapproximately elliptical in cross-section, the securing-n ut, and themechanism for securing or releasing the nut, substantially as and forthe purposes specified.

2. In combination with the friction-clutch adapted to move and to beadjusted in a slotted bracket secured to the boiler, and thethrottle-valve-rod lever attached to said clutch, the compound leverfulcrumed to the throttlelever and connected with the friction-clutch,whereby said clutch may be operated, substantially as specified.

3. ln combination with the friction-clutch, the slotted bracket andthrottlelever, the compound lever, and the spring secured to thefriction-clutch and adapted to shift the parts to and from a normalposition, substantially as specified.

In testimony whereofl aifix my signature, in presence of two witnesses,this 19th day of May, 1882.

11. R. TR-AMM ELL.

